Glass fiber gridding cloth gluing and unwinding system and unwinding method

Abstract

The invention provides a glass fiber gridding cloth gluing and unwinding system and method. The unwinding system comprises a rack, an unwinding servo system, an S roller system, an air cylinder and a linear potentiometer, wherein the unwinding servo system, the S roller system, the air cylinder and the linear potentiometer are arranged on the rack. When the tension of the cloth cover fluctuates, the system automatically adjusts the unwinding speed and keeps the unwinding tension. When the cloth cover is loose, for example, after a cloth roll is replaced and connected, the unwinding system automatically rotates reversely to tighten the cloth cover, and the requirement for unwinding tension balance is met. By means of the unreeling system, the unreeling speed and tension are automatically adjusted, the tension is balanced when the gridding cloth is unreeled, and the coating quality of the gridding cloth is good.

Description

Technical Field

[0001] The invention belongs to the technical field of glass fiber unwinding equipment, and in particular relates to a glass fiber mesh cloth glue coating unwinding system and an unwinding method. Background Art

[0002] Glass fiber mesh cloth is made of glass fiber warp and weft yarns woven into grey cloth, which is then coated with polymer materials to form a finished mesh cloth. The finished mesh cloth has a stable shape and strong alkali corrosion resistance. It is generally used to enhance gypsum, stone, and exterior wall insulation systems.

[0003] In the industry, the unwinding of grey cloth rolls is generally free unwinding. This mode has problems such as uneven tension of mesh cloth and uncontrolled unwinding. The mesh cloth is prone to skew in warp and weft, which affects the quality of mesh coating. Some adopt magnetic powder controller to control the unwinding of grey cloth. The unwinding control of cloth rolls is single. When the cloth rolls deviate from the center are unwound, they are sometimes fast and sometimes slow. The tension of the cloth surface fluctuates greatly, which affects the quality of glue dipping. After a period of use, the performance of magnetic powder decreases, and the unwinding control fails or even locks, which seriously affects the coating quality of mesh cloth. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a glass fiber mesh gluing unwinding system and unwinding method. The present invention designs an unwinding system with adjustable unwinding position and automatically controllable tension for glass fiber mesh gluing, which improves the gluing quality of the mesh and improves the automation level of the mesh coating equipment. The technical solution provided by the present invention is as follows:

[0005] The present invention provides a glass fiber mesh cloth glue coating unwinding system, comprising a frame, an unwinding servo system arranged on the frame, and a tension sensing system composed of an S-roller system, an S-roller damping mechanism, and a linear potentiometer;

[0006] The unwinding servo system controls the unwinding speed of the mesh cloth;

[0007] The S roller system is arranged inside the frame, and includes an S roller system fixed shaft, an S roller system connecting plate, and an S roller system swing shaft. Both ends of the S roller system fixed shaft are arranged on the frame through a bearing structure. Both ends of the S roller system fixed shaft are connected to the S roller system swing shaft through the S roller system connecting plate respectively. The S roller system connecting plate is fixedly connected to the S roller system fixed shaft, and is connected to the S roller system swing shaft through the bearing structure.

[0008] The S-roller damping mechanism is connected to the S-roller system coupling plate; its function is to provide a constant damping force and adjust the S-roller system back to normal state;

[0009] The linear potentiometer detects the position of the S-roller damping mechanism to sense the mesh tension.

[0010] In the embodiment of the present invention, the S-roller damping mechanism is a cylinder, the linear potentiometer pull rod is fixed on the cylinder telescopic rod, and the linear potentiometer pull rod telescopes together with the cylinder telescopic rod.

[0011] In the embodiment of the present invention, the cylinder is fixed to a wall panel on one side of the frame, and the end of the cylinder telescopic rod is connected to the middle of the S-roller system connecting plate on one side through a pin shaft.

[0012] In an embodiment of the present invention, the unwinding servo system includes an unwinding servo motor, which is installed at the bottom of one side of the outside of the frame and is connected to the unwinding sprocket through a sprocket and a chain; the unwinding sprocket drives the unwinding shaft to rotate, and the mesh cloth unwinding air expansion shaft is installed on the unwinding air expansion shaft chuck, and the chuck is fixed on the unwinding shaft.

[0013] In an embodiment of the present invention, the unwinding system further comprises a PLC controller, which is respectively connected to the linear potentiometer and the unwinding servo motor by signals, receives the signal from the linear potentiometer, and controls the action of the unwinding servo motor.

[0014] It also includes an unwinding base located below the frame, a fixed track is arranged on the unwinding base, and frame transverse moving guide rails matching the fixed track are arranged on both sides of the bottom of the frame;

[0015] A mobile driving mechanism is arranged at one end of the frame, driving the frame to move horizontally along a fixed track on the unwinding base;

[0016] In an embodiment of the present invention, the mobile driving mechanism includes a mobile hand wheel and a lead screw connected and arranged transversely along the frame, the lead screw is fixed on the frame chassis, and the lead screw slider is fixed on the unwinding base.

[0017] In an embodiment of the present invention, the mobile driving mechanism is an electric lead screw, which is fixed on the frame chassis, and a slider of the electric lead screw is fixed on the unwinding base.

[0018] As a second aspect of the present invention, a method for coating and unwinding a glass fiber mesh cloth is provided, comprising the following steps:

[0019] S1, assembling the unwinding air inflation shaft for placing the mesh cloth onto the unwinding shaft;

[0020] S2, after the mesh cloth is unrolled, it passes under the swing axis of the S roller system, then passes over the fixed axis of the S roller system, and is introduced into the glue coating unit. The running path of the mesh cloth is an S-shaped path.

[0021] In the method, when the tension of the mesh cloth fluctuates, the torque applied by the mesh cloth to the S-roller system changes, the S-roller system rotates around the fixed axis and drives the cylinder to extend and retract, the cylinder extension rod drives the linear potentiometer pull rod to move, the linear potentiometer outputs a potential signal to the PLC controller, the PLC controller sends a current adjustment signal to the servo motor after receiving the potential signal, the servo motor synchronously adjusts the motor direction and speed, reduces or increases the unwinding speed, and dynamically adjusts the unwinding tension; when the cloth surface is relaxed, the servo motor reverses to tighten the mesh cloth.

[0022] The length of the cloth roll is related to the warp of the unwinding cloth roll. When the unwinding is nearing the end, the warp of the unwinding cloth roll is the smallest, and the ratio of the unwinding line speed to the unwinding speed is the smallest (assuming that the unwinding line speed remains unchanged and the unwinding speed reaches the maximum speed of the entire cloth roll unwinding); the PLC calculates and processes the received unwinding servo speed and the unit running line speed signal to meet the system set shutdown conditions. The PLC sends a shutdown command to the servo motor, and the unit automatically stops and waits for the cloth roll joint.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The glass fiber mesh cloth unwinding system provided by the present invention has a mesh cloth unwinding position that can be moved laterally. By rotating the hand wheel to drive the lead screw or the electric lead screw, the unwinding frame and the mesh cloth roll can be driven to move laterally, and the cloth roll can be adjusted to a desired position to facilitate production;

[0025] 2. The unwinding servo system provided by the present invention automatically adjusts the unwinding tension, and the coating quality of the mesh cloth is good. When the unwinding system of the present invention is used, the system automatically adjusts the unwinding speed and tension, and the tension of the mesh cloth is balanced when unwinding; when the tension of the cloth surface is small, the system automatically adjusts the unwinding speed to maintain the unwinding tension; when the cloth surface is loose, such as after the cloth roll is changed, the unwinding system automatically reverses and tightens the cloth surface to achieve the requirement of balanced unwinding tension.

[0026] 3. When the cloth roll unwinding is about to end, the servo motor will stop automatically with an early warning. When the unwinding is about to end, the unwinding cloth roll has the smallest warp, and the ratio of the unwinding line speed to the unwinding speed is the smallest; the PLC calculates and processes the received unwinding servo speed and the unit running line speed signal, and reaches the system set stop condition. The PLC sends a stop command to the servo motor, and the unit automatically stops. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 A side view of a glass fiber mesh gluing and unwinding system provided in Example 1 of the present invention;

[0029] Figure 2 A front view of a glass fiber mesh gluing and unwinding system provided in Example 1 of the present invention;

[0030] Figure 3 A schematic diagram of the lateral movement of a glass fiber mesh gluing and unwinding system provided in Example 1 of the present invention;

[0031] Figure 4 A schematic diagram of an unwinding base and a lateral moving guide rail of an unwinding frame before assembly in a glass fiber mesh cloth glue coating unwinding system provided in Example 1 of the present invention;

[0032] Figure 5 A schematic diagram of the assembly of an unwinding base and a lateral moving guide rail of an unwinding frame in a glass fiber mesh gluing unwinding system provided in Example 1 of the present invention;

[0033] Figure 6 A schematic diagram of an assembly of a glass fiber mesh gluing and unwinding system provided in Example 1 of the present invention in which a hand wheel rotates to drive a lead screw to rotate and a movable guide rail to move laterally;

[0034] Figure 7 A schematic diagram of closing and opening of the air expansion shaft chuck in a glass fiber mesh gluing unwinding system provided in Example 1 of the present invention, wherein a is a schematic diagram of closing the chuck, and b is a schematic diagram of opening the chuck;

[0035] Figure 8 A schematic diagram of a normal state tension control of a glass fiber mesh cloth glue coating and unwinding system provided in Example 2 of the present invention, in which the mesh cloth tension is normal and the cylinder is in a normal telescopic state;

[0036] Fig. 9 A schematic diagram of tension control of a glass fiber mesh cloth gluing and unwinding system provided in Example 2 of the present invention when the mesh cloth tension increases. At this time, the mesh cloth tension fluctuates and the cylinder follows the S-roller system to extend and retract.

[0037] Among them, 1-frame, 2-unwinding base, 3-unwinding servo system, 4-S roller system, 5-cylinder, 6-linear potentiometer, 7-unwinding air shaft, 8-unwinding shaft, 9-moving hand wheel;

[0038] 201-frame lateral movement guide rail, 202-track;

[0039] 301- unwinding servo motor, 302- chain, 303- unwinding sprocket, 304- servo motor sprocket;

[0040] 401-S roller system fixed shaft, 402-S roller system connecting plate;

[0041] 403-S roller system swing axis, 501-cylinder telescopic rod;

[0042] 801- Unwinding air expansion shaft chuck;

[0043] 901-Lead screw. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] Example 1, a glass fiber mesh cloth glue coating and unwinding system

[0047] like Figure 1 and Figure 2 As shown, the mesh cloth gluing unwinding system includes a frame 1, an unwinding base 2, an unwinding servo system 3, an S-roller system 4, a cylinder 5 and a linear potentiometer 6.

[0048] The frame 1 is made of materials such as steel plates and square steels.

[0049] See Figure 3 to Figure 6 A fixed track 202 is arranged on the unwinding base 2, and frame transverse moving guide rails 201 cooperating with the fixed track 202 are arranged on both sides of the bottom of the frame 1, and a moving hand wheel 9 is arranged at one end of the frame 1, and the moving hand wheel 9 is connected to a lead screw 901 arranged transversely along the frame, and the tail end of the lead screw 901 is fixed on the chassis of the frame 1, and the slider of the lead screw 901 is fixedly connected to the unwinding base 2. The moving hand wheel 9 is rotated to rotate the lead screw 901, driving the frame transverse moving guide rail 201 to move along the track 202, and driving the frame 1 to move transversely. Figure 4 This is a schematic diagram before the unwinding base 2 and the unwinding frame transverse moving guide rail 201 are assembled. Figure 5 The figure is a schematic diagram of the assembly of the "I"-shaped track 202 of the unwinding base 2 and the horizontal moving guide rail 201 of the unwinding frame. The horizontal moving guide rail 201 of the frame is arranged on both sides of the lower edge of the frame, and is an internally open "I"-shaped slot. The "I"-shaped track 202 corresponding to the horizontal moving guide rail 201 of the frame is fixed on the upper part of the unwinding base 2.

[0050] like Figure 3As shown, the S-roll system 4 is arranged inside the frame 1, and includes an S-roll system fixed shaft 401, an S-roll system connecting plate 402, and an S-roll system swing shaft 403. Both ends of the S-roll system fixed shaft 401 are arranged on the frame 1 through a bearing structure, and both ends of the S-roll system fixed shaft 401 are respectively connected to the S-roll system swing shaft 403 through the S-roll system connecting plate 402. The S-roll system connecting plate 402 is fixedly connected to the S-roll system fixed shaft 401, and is connected to the S-roll system swing shaft 403 through a bearing structure.

[0051] The cylinder 5 is fixed on a wall plate on one side of the frame 1, and the cylinder telescopic end 501 is connected to the middle of the S-roller system connecting plate 402 on one side through a pin shaft; the linear potentiometer 6 is fixed below the cylinder 5, and the linear potentiometer pull rod is fixed on the cylinder telescopic rod. The linear potentiometer pull rod telescopes with the cylinder telescopic rod, and the linear potentiometer generates a potential signal and outputs it to the PLC. In the present invention, the cylinder is used to provide a constant air pressure and air expansion force.

[0052] The air pressure of the cylinder is generally set to 2-4KG. When the telescopic rod is under zero force, it is extended to the maximum limit of the cylinder by the air pressure. When the pressure is greater than the air pressure of the cylinder, the telescopic rod is compressed and retracted. The linear potentiometer pull rod is fixed on the telescopic rod of the cylinder and moves with the cylinder. The output end obtains a potential signal that is related to the displacement. The signal is fed back to the PLC. After processing by the PLC, it sends a signal to the unwinding servo motor, and the servo motor adjusts the speed according to the signal command.

[0053] The unwinding servo system 3 includes an unwinding servo motor 301, which is installed at the bottom of one side of the outside of the frame 1 and connected to the unwinding sprocket 303 through a sprocket 304 and a chain 302. The output shaft of the unwinding servo motor 301 is connected to the sprocket 307, and the chain 302 connects the sprocket 304 and the unwinding sprocket 303. The unwinding sprocket 303 is arranged on the unwinding shaft 8 to drive the unwinding shaft 8 to rotate. The mesh cloth unwinding air-expansion shaft 7 is installed on the unwinding shaft 8, and the unwinding air-expansion shaft chuck 801 is fixed on the unwinding shaft 8. Figure 7 Figure a in the middle is a schematic diagram of the chuck closing, and figure b is a schematic diagram of the chuck opening. When replacing the cloth roll, the upper parts of the unwinding air-expanding shaft chucks 801 on both sides are pushed toward the outside of the air-expanding shaft 7, and the unwinding air-expanding shaft chucks 801 are tilted, exposing the shaft head of the unwinding air-expanding shaft 7, and the unwinding air-expanding shaft 7 is separated from the unwinding shaft 8, and the unwinding air-expanding shaft 7 can be removed. After the unwinding air-expanding shaft 7 is placed, the upper parts of the chucks 801 on both sides are pushed toward the air-expanding shaft, and the unwinding air-expanding shaft chucks 801 are closed. After the unwinding air-expanding shaft 7 is filled with air, the cloth roll is pressed tightly, and the cloth roll, the unwinding air-expanding shaft 7, the unwinding shaft 8, the sprocket 304, the chain 302, the unwinding sprocket 303, and the unwinding servo motor 301 constitute an active unwinding device.

[0054] It also includes a PLC controller, which is connected to the linear potentiometer 6 and the unwinding servo motor 301 respectively, receives the signal of the linear potentiometer 6, and controls the action of the unwinding servo motor 301.

[0055] As another implementation, the lead screw may adopt an electric lead screw structure to drive the frame to move laterally, the electric lead screw is fixed on the frame chassis, and the slider of the electric lead screw is fixed on the unwinding base.

[0056] Furthermore, an unwinding correction probe and a signal controller are added to the unwinding lateral moving device. The correction sensor is preferably arranged on the unwinding base and on one side of the frame. The driving mechanism (electrode) of the electric screw and the correction sensor are respectively connected to the PLC controller signal. The correction sensor transmits a signal to the PLC controller, and the PLC controller controls the electric screw to automatically move horizontally left and right to realize the automatic unwinding correction function.

[0057] Embodiment 2, a method for coating and unwinding glass fiber mesh cloth

[0058] Assemble the unwinding air inflation shaft 7 with the mesh cloth placed on it onto the unwinding shaft 8;

[0059] like Figure 8 As shown, after the mesh cloth is unrolled, it passes under the swing shaft 403 of the S roller system, then passes over the fixed shaft 401 of the S roller system, and is introduced into the glue coating unit. The running path of the mesh cloth is an S-shaped path.

[0060] When the tension of the mesh cloth fluctuates, the force applied by the mesh cloth to the swing shaft 403 changes, and the torque applied by the mesh cloth to the S roller system changes, driving the S roller system to rotate around the fixed shaft 401 of the S roller system. The fixed shaft 401 of the S roller system and the connecting plate 402 of the S roller system drive the cylinder telescopic rod 501 connected to the S roller system to extend and retract. The cylinder extension drives the linear potentiometer 6 pull rod to extend and retract, and the pull rod drives the brush to move along the linear potentiometer resistor. The output end obtains a potential signal that is related to the displacement. The signal is fed back to the PLC controller. The PLC receives the linear potentiometer potential signal. After processing, the PLC controller sends a current adjustment signal to the unwinding servo motor 301. The unwinding servo motor 301 synchronously adjusts the output torque, increases or decreases the unwinding speed, and dynamically adjusts the unwinding tension. When the cloth surface is relaxed, the servo motor reverses to tighten the mesh cloth.

[0061] like Fig. 9 As shown in the figure, the mesh cloth tension increases, the force applied by the mesh cloth to the swing shaft 403 of the S roller system increases, the S roller system 4 rotates to the right around the fixed shaft 401 of the S roller system, the S roller system connecting plate 402 drives the cylinder telescopic rod 501 connected to the S roller system to compress, and the linear potentiometer pull rod moves to Fig. 9The right side moves, the pull rod drives the brush to move along the linear potentiometer resistor, and the output end obtains a potential signal that is in a certain relationship with the displacement (the potentiometer outputs a potential signal that needs to speed up the unwinding). The potential signal is transmitted to the PLC. After the PLC processes it, it sends a signal to increase the speed to the unwinding servo motor 301. After the servo motor receives the signal, the speed of the servo motor increases. The PLC controls the unwinding servo motor to speed up, the unwinding of the mesh cloth is accelerated, the tension of the cloth surface decreases, and the S roller system returns to Figure 8 As shown in the figure, automatic constant tension unwinding is achieved.

[0062] When the mesh cloth tension decreases, the force applied by the mesh cloth to the swing shaft 403 of the S roller system decreases, the cylinder 5 is pushed out, and the S roller system 4 moves around the fixed shaft 401 of the S roller system. Figure 8 Turn left, the linear potentiometer pull rod moves to Figure 8 Move to the left, the potentiometer outputs a signal to the PLC, and the PLC instructs the unwinding servo motor 301 to reduce the speed or change the direction, slow down the unwinding speed or rewind the cloth roll, and the cloth tension is automatically adjusted to constant tension unwinding.

[0063] The length of the cloth roll is related to the warp of the unwinding cloth roll. When the unwinding is nearing the end, the warp of the unwinding cloth roll is the smallest, and the ratio of the unwinding line speed to the unwinding speed is the smallest (assuming that the unwinding line speed remains unchanged and the unwinding speed reaches the maximum speed of the entire cloth roll unwinding); the PLC calculates and processes the received unwinding servo speed and the unit running line speed signal to meet the system set shutdown conditions. The PLC sends a shutdown command to the servo motor, and the unit automatically stops and waits for the cloth roll joint.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A glass fiber mesh cloth glue coating and unwinding system, characterized in that: It includes a frame, an unwinding servo system arranged on the frame, and a tension sensing system composed of an S-roller system, an S-roller damping mechanism, and a linear potentiometer; The unwinding servo system controls the unwinding speed of the mesh cloth; The S roller system is arranged inside the frame, and includes an S roller system fixed shaft, an S roller system connecting plate, and an S roller system swing shaft. Both ends of the S roller system fixed shaft are arranged on the frame through a bearing structure. Both ends of the S roller system fixed shaft are connected to the S roller system swing shaft through the S roller system connecting plate respectively. The S roller system connecting plate is fixedly connected to the S roller system fixed shaft, and is connected to the S roller system swing shaft through the bearing structure. The S-roll damping mechanism is connected to the S-roll system coupling plate; The linear potentiometer detects the position of the S-roller damping mechanism to sense the mesh tension.

2. The glass fiber mesh cloth glue coating and unwinding system according to claim 1 is characterized in that: The S-roller damping mechanism is a cylinder, the linear potentiometer pull rod is fixed on the cylinder telescopic rod, and the linear potentiometer pull rod telescopes together with the cylinder telescopic rod.

3. The glass fiber mesh cloth glue coating and unwinding system according to claim 2 is characterized in that: The cylinder is fixed on a wall plate on one side of the frame, and the end of the cylinder telescopic rod is connected to the middle of the S roller system connecting plate on one side through a pin shaft.

4. The glass fiber mesh cloth glue coating and unwinding system according to claim 3 is characterized in that: The unwinding servo system includes an unwinding servo motor, an output shaft of the unwinding servo motor is connected to a sprocket, a chain connects the sprocket and the unwinding sprocket, the unwinding sprocket is arranged on the unwinding shaft, drives the unwinding shaft to rotate, the mesh cloth unwinding air-expansion shaft is installed on the unwinding shaft, and the unwinding air-expansion shaft chuck is fixed on the unwinding shaft.

5. The glass fiber mesh cloth glue coating and unwinding system according to claim 4 is characterized in that: The unwinding system further comprises a PLC controller, which is respectively connected to the linear potentiometer and the unwinding servo motor by signals, receives the signal of the linear potentiometer, and controls the action of the unwinding servo motor.

6. The glass fiber mesh cloth glue coating and unwinding system according to claim 5, characterized in that: It also includes an unwinding base located below the frame, a fixed track is arranged on the unwinding base, and frame transverse moving guide rails matching the fixed track are arranged on both sides of the bottom of the frame; A mobile driving mechanism is arranged at one end of the frame to drive the frame to move horizontally along a fixed track on the unwinding base.

7. The glass fiber mesh cloth glue coating and unwinding system according to claim 6, characterized in that: The mobile driving mechanism comprises a mobile hand wheel and a lead screw which is arranged transversely along the frame, the lead screw is fixed on the frame chassis, and a slider of the lead screw is fixedly connected to the unwinding base.

8. The glass fiber mesh cloth glue coating and unwinding system according to claim 6, characterized in that: The mobile driving mechanism is an electric lead screw, which is fixed on the frame chassis, and a slider of the electric lead screw is fixed on the unwinding base.

9. A method for coating and unwinding a glass fiber mesh cloth, characterized in that: The steps include: S1, assembling the unwinding air inflation shaft for placing the mesh cloth onto the unwinding shaft; S2, after the mesh cloth is unrolled, it passes under the swing axis of the S roller system, then passes over the fixed axis of the S roller system, and is introduced into the glue coating unit. The running path of the mesh cloth is an S-shaped path.

10. The glass fiber mesh cloth glue coating and unwinding method according to claim 9, characterized in that: In the method, when the tension of the mesh cloth fluctuates, the torque applied by the mesh cloth to the S-roller system changes, the S-roller system rotates around the fixed axis and drives the cylinder to extend and retract, the cylinder extension rod drives the linear potentiometer pull rod to move, the linear potentiometer outputs a potential signal to the PLC controller, the PLC controller sends a current adjustment signal to the servo motor after receiving the potential signal, the servo motor synchronously adjusts the motor direction and speed, reduces or increases the unwinding speed, and dynamically adjusts the unwinding tension; when the cloth surface is relaxed, the servo motor reverses to tighten the mesh cloth.

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